Why not just using Lua instead?
OK - Got this working. Just in case anyone is interested:
<macro name="xplayN">
<input pattern="^([^,]*),([^,]*),(.*)$">
<match>
<action function="play-file" data="$1/$2.wav"/>
<action function="play-file" data="phrase:xplayN:$1,$3"/>
</match>
</input>
<input pattern="^([^,]*),([^,]*)$">
<match>
<action function="play-file" data="$1/$2.wav"/>
</match>
</input>
</macro>
Example of use:
<action application="playback"
data="phrase:xplayN:/home/pabx/004-3774/x,001,0211,0221,0231"/>
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